Cambium is a term used in biology to describe the tissue between a plant's xylem and phloem that is responsible for growth in diameter. The spelling of the word "cambium" is pronounced /ˈkæmbiəm/ and can be broken down into two syllables with the stress on the first syllable. The first syllable contains the 'k' sound followed by the short 'a' sound, while the second syllable contains the 'm' sound and the long 'i' sound. The phonetic transcription of the word "cambium" helps to understand how to correctly pronounce it in English.
Cambium is the thin layer of meristematic tissue situated between the xylem and phloem in vascular plants. It is responsible for the lateral growth of the plant and gives rise to new cells for secondary growth. The cambium is primarily found in woody plants, such as trees and shrubs, and is crucial for their ability to increase in girth over time.
The cambium consists of two types of cells: the actively dividing cells known as fusiform initials and the shorter, more cuboidal cells called ray initials. The fusiform initials divide longitudinally to produce elongated cells that make up the xylem to the inside and the phloem to the outside. These cells differentiate into specialized tissues, with the xylem being responsible for water and mineral transport, while the phloem distributes sugars and nutrients throughout the plant.
The cambium has a vital role in the process of secondary growth, which enables plants to increase in size and support their structural needs. As the cambium continuously produces new cells, the older cells are pushed outward, causing the stem or trunk to thicken. This growth is important for trees to withstand external forces and environmental conditions.
Overall, the cambium is a critical layer of tissue that allows plants to expand their girth and develop secondary tissues for support and transport. Its presence contributes to the longevity and size of woody plants.
The layer of tissue between the wood and bark, which forms the secondary wood, or bast.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
In bot., the mucilaginous fluid which lies between the young wood and the bark of a tree.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "cambium" is derived from the Late Latin term "cambium", which means "exchanging" or "trading". This Latin term was adapted from the Greek word "kambion", which also meant "exchange", particularly in the context of monetary transactions. The term "cambium" was first used in botany in the early 18th century by Carl Linnaeus, who observed the tissue responsible for secondary growth in plants and likened it to a medium of exchange. Thus, the term "cambium" was used to describe the tissue responsible for the exchange of substances between the inner and outer layers of plant stems, facilitating growth and development.